macosx: add "graphical uninstaller" to distribution DMG.

This allows to uninstall the software by people who don't use Terminal.
macosx: Ignore the configure-changed distribution.xml file in git.
reader-pcsc: fix verify/modify pinpad commands

The PC/SC v2 part 10 commands for PIN verify and modify were wrong after
a change in pcsc-lite.
See a similar change in http://lists.alioth.debian.org/pipermail/pcsclite-cvs-commit/2013-December/006364.html

Should fix issue #199
reader-pcsc: fix compiler warning

Add a missing "const" for a constant C-string

reader-pcsc.c: In function `detect_reader_features':
reader-pcsc.c:926:20: warning: initialization discards `const' qualifier from pointer target type [enabled by default]