- add definitions for IS 2009, 7046 and 12474
- remove useless file for a ISO 14583 since there are no such screws on the market
- rename "coarse" to "regular" since this what it actually is according to the norms
- uniform the x1 threads (for x2.0 etc we use a trailing zero and for some we use x1, for some already x1.0, thus consistently use x1.0)
- add some ISO 10642 entries
- correct ISO 4762:
- correct some values
- the does does not define a size M27
- add the two missing sizes
- propose valid values for the cut depth and diameter when creating new holes
- add new definitions for metric fine
- some code simplification and comments
