support MinGW

[ramonsnir]

Today Windows is only supported with Cygwin. This is (somewhat) an issue, because the "Git Bash" utility uses MinGW.

One issue at least that exists:

• grep doesn't support the -P argument

[ramonsnir]

Solution:

• download latest MinGW and copy its grep.exe (it comes with grep 2.21) into the /bin directory.
• download latest Perl (tested with ActivePerl) and copy its perl.exe into the /bin directory.

[ramonsnir]

detoul add-to, detoul edit, and perhaps more - do not work properly (detoul add-to writes to the file, instead of appending, detoul edit just hangs), although detoul create does appear to work.

Reopening. Relabeling.