Addresses #53

Now crashed when wrong keywords are used in COORDINATION SWITCH=...
Small fix in plumed mklib

Target shared library is deleted before attempting its creation.
In this manner, if an error arises during compilation, the
library will not be there.

It is important to have LOAD FILE=xxx.cpp working properly.
E.g. if there is an error during compilation, a possibly existing
library is deleted.
Improved changelog
Fixes #54

Now give a warning in metadynamics if grid is adjusted to fit periodicity
Mistakes in switching function input for multicolvar now trigger errors.

Fixes #53
updated changelog
Flushes by default every 10000 steps

Fixes #55
Gyration: ported the optimizations to v2.0
updated for GYRATION
Small fix in changelog
Fix changelog

important changes should go first I think
Merge tag 'v2.0.1' into v2.0-gpu-balance