Merge pull request #327 from grauehaare/master

New packages: libmspack, wxWidgets and wxMaxima
wxWidgets: move development files to -devel; -devel conflicts with wxGTK-devel.
wxMaxima: enable printing support; needs maxima at runtime.
wxMaxima: install desktop file and icon.
profile-sync-daemon: update to 5.47
profile-cleaner: update to 2.27
notmuch: use variable for download location
Merge pull request #328 from graysky2/master

profile-sync-daemon: update to 5.47
Start conversion of doc/manual.txt file from asciidoc to markdown.
Manual.md: more tweaks.
Manual.md: last conversion tweak.
Retire doc/ (superseded by Manual.md).
Update Manual.md
Update Manual.md
Update Manual.md
README.md: sync with reality.
Merge xbps-src code to make it usable in a standalone mode.

The new xbps-src configuration file is `etc/conf` where you can
add your local overrides from defaults set via `etc/defaults.conf`.

To use this xbps-src, run these steps:

	$ make
	$ sudo make setup (to make chroot helper setgid)
	$ ./xbps-src ...
.gitignore: update.
Makefile: ignore etc/conf in the git repository after running make.
README.md: update description and instructions.