environment variable configuration and documentation

Hello Christian,


The documentation of envvars is quite light, see     http://docs.miktex.org/manual/envvars.html


I realized by experimenting that MikTeX TeX engines are an MSYS application, so there are the following things to note


* either you configure the TEXINPUTS and suchlikes in the MSYS format: 

    /c/Some/path:/c/Some/other/path

* or you configure them in the Dosc format

    c:\Some\path;c:\Some\other\path


In the case that DOS format is used, MikTeX, the bash script wrappers (like texi2pdf.exe) will need to call some conversion script before calling the script itself).  Here is a script that can do the job:

https://savannah.gnu.org/bugs/download.php?file_id=34935


(In the script the user can tell which format he/she used with some MIKTEX_ENVTYPE envvar.


There are other problems and/or info missing:


* I think that MikTeX always places the current directory first, even though TEXINPUTS specifie otherwise, I think that this is a MikTeX bug, please feedback,

* Documentation does not give the following information (which I infer, please confirm it)

** Empty dir means: insert here the defaults (ie the root dir configuation)

** tailing \\ (in DOS format, or // in MSYS format) means "search dir recursively"

** you can also used / instead of / in Dos format, this is OK.

** If one has MSYS installed on his/her machine, and this standalone MSYS has some mounting done in the fstab file, e.g. /local pointing at c:\msys\local, then MikTeX will understand that provided that the standalone MSYS is earlier in the system PATH, and therefore the msys.dll that is loaded is that of standalone MSYS.


VBR,

   Vincent. 		 	   		  
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