- when restart from GRID (RGRID+RESTART) doens't read the HILLS (but continue to append)
- if not restart then the HILLS are added to the existing GRID
- the grid is not external anymore, in this way when you write the grid you write the total one
- grid files are written only once in case of multiple walkers
NOTE: the grid is not modified for the BIASFACTOR because the BIASFACTOR is not currently stored
in the grid, this means that if you restart from a grid

[makedoc]

[makedoc]

fix a problem when md.log was appended
plumed was trying to write on it after
md.log was already closed

[makedoc]

[makedoc]

[makedoc]

[makedoc]

[makedoc]

[makedoc]

Now only the dictionary is generated from plumed.
Everything else is written in vimscript.

As a result, plumed.vim is much smaller.

I also made the shortcuts optional

@alexvoronov pointed out that the example was actually wrong.

same as b2b2176c

Fixes #140

I checked that this regtest fails without last commit

Related to #190

No EOL at the end of the file is only tolerated in input file
(e.g. plumed.dat) and not in other files (including HILLS files).

Indeed, when using multiple walkers, it is possible that transiently
the HILLS file from other walkers have incomplete lines.
With this fix, those lines are ignored and read at the next iteration.

This fixes #190