The pk of label table consisted of an autoincrement and fk, changed label.label_id from serial type to int.

Could not tell from segment how it was segmented. Added segmentator foreign key to segment table.
Renamed segmetator to segmenter.

Added project + is_public to job.

Willem needed to have a feature which spans multiple gps-fixes.
Previously we have a segment is a gps-fix with some acceleration records.
This has been changed that a segment consists of one or many gps-fixes with each some accelerations records.
Rename job.id to job.project_id.
Make job.is_public FALSE by default.
Merge remote-tracking branch 'origin/eclipselink' into eclipselink