Add operators for float comparison
Use custom operators for float comparison
Move c2f* anf f2c* functions to dedicated module to avoid circular dependencies
Use custom operators for float comparison
Add -Wno-unused-function to default debug flags, move -g to common flags
Merge pull request #50 from Xarthisius/comparisons

Use custom operators for float comparison
[gravity] allow to choose order of gradient operator for calculating acceleration from gravitational potential
Merge pull request #51 from Xarthisius/pot2accel_hiord

[gravity] allow to choose order of gradient operator for calculating acc...