[ENH] Allow extra function in the mathematical calculation field

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@49168 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] content warning: added missing panel-body class, changed style to panel-warning

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@49169 b456876b-0849-0410-b77d-98878d47e9d5
[ENH] Adding some functions for math calculations

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@49170 b456876b-0849-0410-b77d-98878d47e9d5
[MOD] shortened overexplained link text

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@49171 b456876b-0849-0410-b77d-98878d47e9d5
[MRG] Automatic merge, branches/12.x 49163 to 49170

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@49172 b456876b-0849-0410-b77d-98878d47e9d5