Only minor changes made to src/Makefile.am and wscript files

See: https://sourceforge.net/tracker/?func=detail&aid=3361963&group_id=153444&atid=787793

Scintilla deprecated SCI_GETUSEPALETTE and SCI_SETUSEPALETTE messages,
and since we don't build with deprecated API support they aren't
available anymore.

This was broken if the base path ended with a directory separator.

Defining MSYS=1 is cleaner than requiring users to define CP, RM, etc.

This PREFIX works on both cmd.exe and MSYS, whereas backslash confuses
MSYS.
Use copy /y in doc/makefile.win32.
Remove unused targets binclean, exec.

This moves CTags files into their own subdirectory and moves the
tagmanager source and header files into their own subdirectory.

The bulk of the work was done by Colomban.

Conflicts:
	makefile.win32
	src/makefile.win32

Based on patch by Dimitar Zhekov.
MSYS users should now define 'CP_R = cp -r'.
Removed override of MAKE, as this is set automatically.

The export plugin uses the pow() function from libm without linking against
it. It has worked so far because Geany itself has a link against libm, but
should that be removed in the future, this would fail to resolve symbols.
Signed-off-by: Chow Loong Jin <hyperair@debian.org>
Signed-off-by: Colomban Wendling <ban@herbesfolles.org>

Even this has been done post-release, the changes were also used
for the 1.22 release.

The 'deb' target was supposed to build a Debian package from the
sources but the 'debian/' subdirectory never existed.

Automake provides dist-bzip2 since at least version 1.8, so remove our
own target.  Moreover bzip2 distributions are a little obsolescent now
Xz is available and spread enough.

The Makefile rule comes from https://live.gnome.org/Git/ChangeLog with
slight modifications.