fix: Crash with 1000 years database

- Add details for 64 bits compilation and debugging in REAMD.md

Fix #5

README.md

@@ -8,6 +8,7 @@ VGEST is software developped in Pascal by Jean-Claude Bader [^Bader2016]. It ser
 VGEST has only been tested on Windows XP or superior.
 
 * Download Free Pascal I386 for Windows 32 bits: https://www.freepascal.org/down/i386/win32.html
+* For compilation in 64 bits, download the x86_64 cross compiler: https://www.freepascal.org/down/x86_64/win64.var
 * Install it by running the downloaded executable
 
 ## Compilation
@@ -20,6 +21,10 @@ C:\FPC\bin\i386-win32\fpc.exe src\ENDE.PAS && move /Y src\ENDE.exe .
 C:\FPC\bin\i386-win32\fpc.exe src\REGLAGE.PAS && move /Y src\REGLAGE.exe .
 ```
 
+For 64 bits compilation, add `-Px86_64` parameter between `fpc.exe`  and the source file on each line.
+
+For debugging, in case of a crash of the application, add the parameter `-gl` to the compilation command line in order to get the file and the line number where the crash occurs.
+
 ## Get started with the example
 
 The `example` directory contains all the configuration for calculating statistics about respecting a maximum flow of 110 m<sup>3</sup>/s at Paris. These statistics are calculated from the Seine River Basin naturalised flow database between 1993/01/01 and 2009/12/31 [^Hydratec2011].

src/DECLARA.PAS

@@ -13,7 +13,7 @@ CONST  {valeurs}
  YInterpolPermi= true;     {pour autoriser reconst des lacunes isol‚es de d‚bits stations}
  YLacune       = -99;      {code lacune de d‚bit}
  YNbfreq       = 8;
- YNbmaxAn      = 250;      {nombre maximal d'ann‚es pouvant ˆtre trait‚es dans le calcul … rebours}
+ YNbmaxAn      = 10000;      {nombre maximal d'ann‚es pouvant ˆtre trait‚es dans le calcul … rebours}
  YNbmaxIter    = 400;      {nombre max d'it‚rations pour obtenir la norme de d‚bit stock‚ … r‚partir}
  YNbmaxIterVol = 100;      {nombre max d'it‚rations pour obtention des bons volumes conditionnant la r‚partition}
  YNbmaxIterVolInit = 50;   {Nombre max d'it‚rations pour obtenir le bon jeu de volumes initiaux}