6th September 2015
Fixed a GUI bug in chord, arc and sector.
Fixed the formula to calculate measuring gears with a caliper in gear calculations, a typo was causing eronious results.
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version 1.1.13
Added right click menu (copy, paste and undo) to entry fields.
Added printing of not to scale working drawings for:
-Dovetail
-Reverse engineer dovetail
-Bevel gears
Added to Dividing head an option to print a reference table for your shop.
Added to PDC (bolt circle) placement of holes in an arc in addition to the more normal spacing around a circle.
Added a gear ratio resolver. From the desired ratio the gear train is calculated. This will work up to 0.0001% accuracy with results of up to 8 gears in the gear train. If your accuracy requirements are less then there will be less gears in the gear train.
Added a lathe change gear calculator. 
Both of these gear calculators off the option of printing the results.
All printing is done in large print as an aid for us older folk whose eyes are not what they used to be.
Added some help accessible via the "?" button to hopefully explain some of the less obvious.  
Cosmetic changes.
Some minor code improvement and some minor bugs fixed.

version 1.1.12
Added Backlash calculations for spur gears measured over pins (or balls).
Some minor cosmetic changes

version 1.1.11
Added bevel gears. Changed some text labels (that got swapped around).

version 1.1.10
Added information on change gear calculations for diametrical pitch and metric module worm threads.
Fixed a nasty bug that would sometimes cause a crash when changing languages.

version 1.1.9
Some incorrect text labelling has been fixed.

version 1.1.8
There are some bugs in version 1.1.7
This version has worm gearing and reverse engineer a dovetail (when you have half a dovetail and need to make the other half).
Added Aciera 40-1 dividing head.
Parts of the Dutch and Spanish translations are currently in English. 

version 1.1.7
In "Tap drill" the BA major diameters and TPI were wrong, this has been corrected. Now both TPI and metric pitch are displayed. Thanks to Charles Stroom for bringing this to my attention.

version 1.1.6
Not released. 

version 1.1.5
Added "center angle and chord" as known values for chord, arc and sector calculations
Spelling corrections to the English language "en.ini" file.

version 1.1.4
Bug fix for crashing when printing and saving PDC (bolt circle) results.

version 1.1.3
Not released

version 1.1.2
Cosmetic change to the interface
Spelling corrections to the English language "en.ini" file
Added 36-1 to dividing head

version 1.1.1
Dovetail calculations corrected.
Bolt circle was calculating using diameter as radius.
Obtuse triangle under certain conditions produce very wrong results.
Dividing head, when adding multiple hole circles the information was stored incorrectly.

version 1.1.0
Initial release