Improve dependencies checks in the build process
- Rename all Find*.cmake files to uppercase, to make things more consistent,
and fix some issues with them (notably the REQUIRED flag)
- Rename SYSTEMDDAEMON to SYSTEMD and only use the libsystemd instead of
libsystemd-daemon because it's deprecated for a long time now
- Provide a WITH_* and WITHOUT_* switch for all optional dependencies
- Document things in the INSTALL file
Wrap a paragraph from INSTALL file to 79 chars
Provide WITHOUT_BOTAN and WITHOUT_SYSTEMD cmake flags
Use them to build without linking to them, even if they are on your system
Add some details in the INSTALL file
Little documentation update
Give two supported compilers, as examples
Document the new optional libbotan dependency
Add the libuuid dependency to the INSTALL file
Little updates to the README and INSTALL files
Document the systemd-daemon optional dependency
Build the man page as part of the build process, if ronn is found
Remove cryptopp dependency, directly include a simple sha1 implementation
Document the bare-JID-for-IRC-users feature