Resolve PHP deprecation notices

"Only variables should be assigned by reference"
Check mod_auth_openid version before writing Apache configuration
file.

New versions use "AuthType OpenID" instead of "AuthOpenIDEnabled On"
fix doc paths in deb package rules
Allow admins and wiki owners to control the per-wiki "active" flag
(used by the "show/hide inactive wikis" filter on the All Wikis
dashboard tab).
update changelog for debian/0.13
remove dependency on "strings" program
update apache config file using dpkg trigger if mod_auth_openid.so changes
ignore generated debian files
add final newline when erroring out
fix array syntax (bug introduced in 2ffd4c11e1d8fc484f2fbe6a31eb9f767ea424d4)
update changelog for debian/0.14
install maxlifetime workaround, delete manual install step, improve docs