CollectAgent should be switched to new Rest API design as soon as possible
Minor improvements to README, Makefile and PUT /analytics/reload methods

- Fixed name of log files for collectagent
- Fixed a few compilation warnings under gcc 7
- README for dcdbpusher now correctly refers to dcdbpusher.conf files
- SensorNavigator is rebuilt after plugin reloads only if data analytics
are currently running

- The multiplier used when computing percentages in the SAR ProcFS
parser has been raised to 100000 to reduce accuracy loss

- Fixed a couple minor bugs arising when only one column is selected
in the stat file
- Fixed a bug in the SAR parser

# Conflicts:
#	.gitignore

- Added the htVal parameter to the copy constructor

- a "filter" configuration parameter has been added, which is used
to discard sensor names when building the sensor navigator
- Can be used to e.g. build a sensor navigator in a collectagent
using only the sensors that are directly collected by it
- Implemented a switch to select leftmost/rightmost binary search
in CacheEntry, used for the QueryEngine

Change perf-plugin implementation: Instead of duplicating sensorGroups per CPU only one group is used with duplicated sensors