calender-timezones: remove no longer needed helper files

The calender-timezones package isn't available any longer since melting
into Thunderbird/Icedove before version 24.
debian/control: sort various fields alphabeticaly

also a really small typo
debian/control: remove build-depens on cdbs
icedove branding: adoptt current Makefile.in style to upstream

To get the branding usable with multiple build directories we need to
change the Makefile.in files to the current needs.
debian/rules: switch to debhelper

Add the changes resulting from the swith to debhelper.
debian/mozconfig*: adding mozconfig files

Adding mozconfig files for building ID and its corrosponding debug
binarys.

'mozconfig.default' includes the basic instructions for all builds. This
file is included later by any other mozconfig file to use the variables
there.
debian/icedove.configopts: Remove no longer needed file

The configuration for the build is now held inside the mozconfig
files.
Switch the old thunderbird*.in files to icedove.*

By removing the the applications name switch in the rules file the old
debian/*.in files are not needed any longer. We only suppport building
Icedove related packages.

Depending on this we also don't need to take care about application
names in the menu or post and preinst scripts. Remove all old
substitutions variables inside the files.
debian/icedove.links: adding /u/b/i link

With CDBS we created the links while building, now just let debhelper do
it.
debian/icedove.dirs: add helper file for needed directories
debian/icedove.install: sort entrys alphabetical
debian/icedove.js: fix small typo and reformat
debian/rules: add override for dh_fixperms

as with cdbs
debian/rules: add override for dh_install

calendar-google-provider and iceowl-extension need special handling, we
repack the already created *.xpi files later. So we have to extract them
first.

Because of the branding we also have to install our own icons for the
Icedove grafics.

The icedove-dev package doesn't needs to ship the
lib{mozalloc,mozjs,xul}.so. We link them to the librarys which come
with the standard icedove package. Removed for deduplication.
debian/rules: add override for dh_shlibdeps
debian/rules: add override for dh_strip

Without the additional argument for dh_strip the icedove-dbg package
isn't builded.
debian/control: remove ${shlibs:Depends} from c-g-p depends

since it's unused
debian/rules: add additional LDFLAGS
debian/rules: correct Icedove version inside icedove.pc during install