FaMetaD (#373)

* copying and adapting the FaMetaD code from the old version, still need to be tested

* forgot keywords

* fixed a few things in the FaMetaD

* improved parsing, error msg, and log printing

* moved updating of pace to update()

* astyle fix

* made FaMetaD work with current acc cacluations

* regtest for FaMetaD

* added printout of reading in of acc value

* fixed a newline error in acc printout

* added manual info for FaMetaD

* astyle fix

* removed not needed values from colvar file in rt

* fixed a problem with restarting of FaMetaD

* added rt for restarting of FaMetaD

* add notes to the manual on restarting and acc factor

* fix for restart regtest for fametad

* added warning if restarting and not reading in acc from file

* astyle fixes

* Added a check to make sure that combing FaMetaD and MPI mwalkers is not allowed

* changed error call to be consistent