Always include polarssl in dist

This is necessary since POLARSSL_SUBDIR
can be empty when configuring --with-system-polarssl, running
make distdir and building an rpm from that distdir afterwards.
Rename pdns init script to pdns.init
Merge pull request #1781 from rubenk/rename-pdns-init-script

Rename pdns init script to pdns.init
Merge pull request #1780 from rubenk/always-include-polarssl-in-distfile

Always include polarssl in dist
Building from git requires newer tools
Move debian-pdns/ to debian/
Adjust debian/rules for new paths
Adjust for debian-pdns/ to debian/ move
Merge pull request #1784 from rubenk/update-readme

Building from git requires newer tools
Merge pull request #1611 from rubenk/move-debian-pdns-to-debian

Remove old debian/ dir, move debian-pdns to debian
debian: Remove unused files, targets
nit, thanks @nivadis
Handle missing Lua when lua backend is enabled

The first case handles ./configure --with-modules='lua' --with-lua=no.
I don't know who would do such a thing, but better handle it in
./configure than bailing out later with a compiler error.

The second case handles ./configure --with-modules=lua when you don't have
Lua installed, which I actually observed since I assumed enabling the
lua backend would be enough, and I did't have the lua headers on my
system.

Fixes #1618
Don't override the user's FLAGS

Fedora for instance sets -fstack-protector-strong
but we override that with -fstack-protector, which is less secure

Ideally we never touch CFLAGS, CXXFLAGS and the like but fixing
that is an exercise left for the reader.
Merge pull request #1786 from zeha/cleanup-debian-dir

debian: Remove unused files, targets
Set BOOST_CPPFLAGS and THREADFLAGS globally

Should fix #1523
Merge pull request #1789 from rubenk/dont-override-user-cflags

Don't override the user's FLAGS
Merge pull request #1788 from rubenk/handle-missing-lua-better

Handle missing Lua when lua backend is enabled
closes #1785 - compile on platforms w/o SO_TIMESTAMP
Merge branch 'master' of github.com:PowerDNS/pdns