Fixed issue with IsNumeric method

IsNumeric wraps doublt.tryparse so the calling form doesn't have to
create a variable. There where three forms that defined the function
sepratly. Now there is one static function in GlobalBl that they all use
Grouped radio buttons on recurring expense form

The radio buttons where grouped in a container to make iteration easier
Added TODO's to MultIinput

Identified a number of areas that need to be thought through before
writing the code
Small changes -non categorized

Removed unnecessary try + catch block in baseDA.
Fixed comobo box in graph chart so user cant manually enter input.
Removed unused usings from MultiInput
Added Feature file

The file is used for writing down general ideas for the program when
there is no internet access
Worked on date change on monthly recurrence

Added an if that makes sure that if the user choose the last day of the
month, that on months with less days it still saves based on the last
month
Merge pull request #5 from Slowking770/Development

Fixed issue with double.Parse wrapper
The other commits are not relevant yet, but i dont know how to merge only specific commits not from the command line yet