Change of latest version URL, not JSON encoded

Now calling /latest-version which is a tidier URL and also passing user
version no to this
This URL now tracks usage via Google Analytics, so I can begin to get an
idea of which version nos users are on, geo data, overall usage etc
No longer using json_encode as it's not JSON encoded, instead splitting
on line breaks and grabbing first array value as the version no
No longer creating full trees

Evolved to a branch loading system only, none of this needed anymore
Setting treeType is no longer an option

Branch loading is now the default and only way to view a tree
Don't look to nextSibling & open/close fix

No need to set node to nextSibling again, only once is needed
If condition is now else if and calling the get-tree.php script
subsequent times and only if we're opening
This means we fix the open/close dir problem and also reload the dir
each time we open
Removing branch & branchReload, this now default

No need to work with the treeType of branch or branchReload, as
reloading branches are now the default and only tree type
Pull classes out of .help class

We have 2 div containers now, so just define key, plus and shortcut in
isolation
Add 8 tag wrapper shortcuts & 2 column format

8 new tag wrapper shortcuts added and moving from 1 column to 2 because
of this extra info
Help screen wider, not as tall

Due to adding extra shortcuts to Help screen, it needs to be bigger to
accomodate this info
Upgrade to CodeMirror 3.1
rename get-tree to get-branch
Always set the scanDir to $docRoot.$iceRoot