Remove some dead code:
- Conditions in m_httpd_stats which can never be true.
- Commented out code in m_sqloper.
- Unused macro in inspircd.h.
Purge the deprecated chanprotect module.
Purge references to the deprecated GetStackedLine method.
Merge pull request #454 from SaberUK/master+misc-improvements

Purge dead code and deprecated types.