support proper 32-byte RNG seeds

• add optional $.help to argument err of error throw
• parse prng_seed: [u8; 32] in rng and inbreeding
• compute the "local" seed by hashing the "global" seed, the strategy and the iteration index
• pass --prng-seed: string, a 64-char long seed to inbreeding run

bins/inbreeding/consts.nu

 export const BIN = "./target/release/inbreeding"
 export const CACHE = ($nu.home-path | path join .cache komodo inbreeding)
+
+const FMT = {
+    env: "(?<env>.*)",
+    seed: "(?<seed>[a-zA-Z0-9]*)",
+    params: '(?<k>\d+)-(?<n>\d+)-(?<nb_bytes>\d+)',
+    timestamp: '(?<timestamp>\d+)',
+    strat: "(?<strategy>.*)" ,
+}
+
+export const ARG_EXPERIMENT_FORMAT = $FMT.seed + '-' + $FMT.env + '-' + $FMT.params
+export const EXPERIMENT_FORMAT = $FMT.timestamp + '-' + $FMT.env + '-' + $FMT.strat + '-' + $FMT.params
+export const FULL_EXPERIMENT_FORMAT = $FMT.seed + (char path_sep) + $EXPERIMENT_FORMAT