Restructuring the Nix manual
Merge branch 'master' of github.com:thatdocslady/nix

Conflicts:
	doc/manual/release-notes.xml
	doc/manual/writing-nix-expressions.xml
Manual build fixes
Nicer file names for the release notes
Release notes: Use a section per version
Remove pointless "license" section
Drop reference to FreeBSD
Drop "service deployment" bla bla
Tweak some chapter titles
Undocument NIX_OTHER_STORES
Drop separate release notes
Fix references to version.txt
Fix parallel make of manpages
Style tweak
Make troubleshooting an appendix
Delete bugs.xml
Remove unhelpful suggestion