non-overlapping search optimization of GS implemented
optimization working good - record of all alternatives
fixed formula for orientation calculation for max coverage in newGreedyPlacement function
modified getGStargets() to look for valid targets only on specific equidistant grid points
added new parameter for sliceOpenAngles + auto fix for fitting the slice in 360degrees
added visalization marker for GS targets - fix required
visualization of grid working
code clean up
multiple grid sizes
deleted out-dated functions
multiple forbidden areas implementation working + modification of getGSTargets() function
code clean up
new implementation of multiple forbidden areas + clearForbiddenAreas service
removed PolygonStamped_array msgs and code clean up
minor fixes
Merge pull request #49 from ipa-mig-mc/feature/search_span_optimization

Feature/search span optimization
Merge pull request #50 from ipa-mig-mc/feature/multiple_forbidden_areas

Feature/multiple forbidden areas
remove seneka_environments and sensor_placement
remove sensor_placement and seneka_environments from metapackage
remove launch and config files that have been moved to seneka_deployment_strategies