Merge pull request #26 from jgralak/dev

New feature: CSV charts
doc mfsmount: Fix wrong mfswritecachesize default value
Merge pull request #48 from aNeutrino/master

doc mfsmount: Fix wrong mfswritecachesize default value
cgi: Clean removing dead code.
add realtime charts
Refactor code part 1
cgi: fix  change  links  of chunkserver
fix typos
Refactor code part 2
master, chunkserver: fix adding data of chart
common: fix generating realtime charts
csv: change column titles
common: remove unused code
common: remove support for older chart formats
cgi: add realtime charts auto refresh
common: remove magic numbers, fix variable names
chunkserver, master: fix chart scale,  fix variable names
common: fix bug no data on realtime charts
common: remove unsed variable percent
common: change prefix of names: APPROXIMATION_COUNTER to ELEMENTS2AVG