v1.2.1 Display previous urls in property grid

Functionality added, previous urls for a web service call are saved and
displayed in the property grid.
Functionality added, to clear the list of previously displayed wsdls or
urls the user can delete the relevant file.
Bug fix, web serivice url validation now only accepts http and https
prev_url.data or prev_wsdl.data.
Bug fix, previous wsdls are now correctly loaded from the file in the
order that they were last accessed.
Bug fix, Web Service call application exceptions now show in the log
panel, previously the program hung.
Source Cleanup, dos2Unix run on source to convert all files to unix line
endings