Added form for adding the level formula values

Added basic form elements (text fields, button, etc.)
Added function for retrieving values from database
Added filling of form from database values to load function
Finished modify level formula

Added validation to the form
Added function for modifying the level formula in the database
Button now saves to the database when clicked
Minor tweaks to form loading
Merge pull request #105 from andeic/issue82

Nice! Works well