[FIX] memcache: If memcache was enabled but without any servers being specified (which is the default) then Tiki became unusable (because prefs are cached), requiring manually editing the database to recover - so, added a checks on critical methods, let the other options be used (such as key_prefix) and display a warning that all is not well.
Also add a usable default value in the hint for memcache_servers.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/11.x@46228 b456876b-0849-0410-b77d-98878d47e9d5
[MOD] performance: Add some helpful info about the PHP realpath_cache and it's usage

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/11.x@46229 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] wysiwyg plugin: Remove spurious linefeeds that get turned into empty <p> tags (and correct the plugin format)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/11.x@46231 b456876b-0849-0410-b77d-98878d47e9d5
Revert r46228: [FIX] memcache: If memcache was enabled but without any servers being specified... (but keep the pref hint addition)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/11.x@46232 b456876b-0849-0410-b77d-98878d47e9d5
[MOD] wysiwyg plugin: Change the "click anywhere to edit" which prevented links etc being used normally, and use a button instead (thanks marclaporte)
TODO refactor and tidy...

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/11.x@46233 b456876b-0849-0410-b77d-98878d47e9d5