Purpose of this patch is to tidy up source code headers. Right now we've got three different types of headers (accountsviewproxymodel.cpp, payeeidentifier.cpp, kcurrecycalculator.cpp). This patch will standardize them to one according to https://community.kde.org/Policies/Licensing_Policy#GPL_Header
Moreover, there are some names in the headers, which have not event touched the file, so it's false authorship. Those names has been removed. List of the names to remove has been taken from CVS (http://kmymoney2.cvs.sourceforge.net/) and git logs.