Update erltrek_calc.erl

* Fix sector_course/2 and sector_distance/2 to set the right directions
Update erltrek_move.erl

* Change periods to commas for showing moves by the impulse engine
Update erltrek_phaser.erl

* Fix misc bugs on reversing conditions
Update README.md

* Now phasers can be fired
* Set tag `baselevel_20140302`