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Also matching Phylogenetics RNG implementation using Gsl

original and optimized versions were run and benchmarked on the
following program:

```ocaml
let () =
  let open Codepi.Orthomam in
  let loggers = [ Bistro_utils.Console_logger.create () ] in
  let db = Codepitk.Orthomam_db.make "_runs/omm" in
  let q =
    search_alignments ~pat:"*GPR87" db
    |> List.hd
    |> query ~convergent_species:(Bistro.Workflow.data species_with_echolocation)
  in
  inhouse_tdg09 q
  |> Bistro.Workflow.path
  |> Bistro_engine.Scheduler.simple_eval_exn ~loggers
  |> print_endline
```

execution time got from 24min to 18s, apparently with very little
changes on pvalue results (after the 6th decimal)

now we can generate a million sites within a minute

> df <- data.frame(n = c(10000,30000,100000,300000), t = c(1.08,2.25,6.27,18.03)) ; fit <- lm(t ~ n, data = df) ; summary(fit)

Call:
lm(formula = t ~ n, data = df)

Residuals:
       1        2        3        4
 0.01851  0.01931 -0.05290  0.01509

Coefficients:
             Estimate Std. Error t value Pr(>|t|)
(Intercept) 4.769e-01  2.997e-02   15.91  0.00393 **
n           5.846e-05  1.886e-07  310.00 1.04e-05 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.04325 on 2 degrees of freedom
Multiple R-squared:      1,	Adjusted R-squared:      1
F-statistic: 9.61e+04 on 1 and 2 DF,  p-value: 1.041e-05

only recompute what is affected by the state change at some
position. Complexity is still quadratic from having to sample from all
positions, but the constant is about 300 times better than last commit.

> df <- data.frame(n = c(10000,13000,20000,23000,30000), t = c(5.03,7.53,16.84,21.58,36.12)) ; fit <- lm(t ~ I(n ^ 2), data = df) ; summary(fit)

Call:
lm(formula = t ~ I(n^2), data = df)

Residuals:
       1        2        3        4        5
 0.05330 -0.13314  0.18311 -0.09938 -0.00389

Coefficients:
             Estimate Std. Error t value Pr(>|t|)
(Intercept) 1.083e+00  1.161e-01   9.335   0.0026 **
I(n^2)      3.893e-08  2.286e-10 170.301 4.46e-07 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.146 on 3 degrees of freedom
Multiple R-squared:  0.9999,	Adjusted R-squared:  0.9999
F-statistic: 2.9e+04 on 1 and 3 DF,  p-value: 4.464e-07

quadratic coefficient decreases from 1.671e-05 to 1.212e-05.

> df <- data.frame(n = c(500,1000,1300,2000), t = c(3.62,12.77,20.77,49.07)) ; fit <- lm(t ~ I(n ^ 2), data = df) ; summary(fit)

Call:
lm(formula = t ~ I(n^2), data = df)

Residuals:
       1        2        3        4
 0.05496  0.11786 -0.24227  0.06946

Coefficients:
             Estimate Std. Error t value Pr(>|t|)
(Intercept) 5.360e-01  1.594e-01   3.362   0.0782 .
I(n^2)      1.212e-05  7.145e-08 169.576 3.48e-05 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.2005 on 2 degrees of freedom
Multiple R-squared:  0.9999,	Adjusted R-squared:  0.9999
F-statistic: 2.876e+04 on 1 and 2 DF,  p-value: 3.477e-05

using (debugged) implementation in phylogenetics, perform simulation
for 500 to 2000 sites. Quadratic complexity is expected here, to
observe it I use the log transform from

	t = K n^2

to
	log t = 2 log n + log K

Running times are only nearly quadratic:

> df <- data.frame(n = c(500,1000,1300,2000), t = c(5.15,18.48,28.63,68.07)) ; fit <- lm(log2(t) ~ log2(n), data = df) ; summary(fit)

Call:
lm(formula = log2(t) ~ log2(n), data = df)

Residuals:
        1         2         3         4
 0.015095  0.007796 -0.061122  0.038231

Coefficients:
             Estimate Std. Error t value Pr(>|t|)
(Intercept) -14.24278    0.36390  -39.14 0.000652 ***
log2(n)       1.85062    0.03608   51.30 0.000380 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.05237 on 2 degrees of freedom
Multiple R-squared:  0.9992,	Adjusted R-squared:  0.9989
F-statistic:  2631 on 1 and 2 DF,  p-value: 0.0003798

Using a quadratic fit is nevertheless not so bad:

> df <- data.frame(n = c(500,1000,1300,2000), t = c(5.15,18.48,28.63,68.07)) ; fit <- lm(t ~ I(n^2), data = df) ; summary(fit)

Call:
lm(formula = t ~ I(n^2), data = df)

Residuals:
      1       2       3       4
-0.1138  0.6815 -0.7004  0.1327

Coefficients:
             Estimate Std. Error t value Pr(>|t|)
(Intercept) 1.086e+00  5.581e-01   1.945 0.191208
I(n^2)      1.671e-05  2.501e-07  66.822 0.000224 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.702 on 2 degrees of freedom
Multiple R-squared:  0.9996,	Adjusted R-squared:  0.9993
F-statistic:  4465 on 1 and 2 DF,  p-value: 0.0002239

context should not include information on a codon, since it is used to
compute a rate matrix between all codons.