Fix to share feature

Under the cover revision

* Added back button

* Fixed minor problems with iOS13

* Updated for compatibility with iOS 10 and above.
* Improved usability and sharing.

* Improved search and navigation
* Cleaner and faster interface
* Support for iPhone 6 and iPhone 6 Plus

* iOS7 compatibility
* Fixed pdf issues

* Improved navigation
* Bug fixes
* Search term highlighting

iOS6 and iPhone 5
The app now supports iOS6 and also the new screen size on the iPhone 5.

Printing
Now you can print a single calculator or the whole calculator tape to any AirPrint printer.

Improved Email
In addition to the standard email, you may now send any calculator or the whole calculator tape as a PDF file attached to an email.

Improved Navigation
Favorites can now also show the list of your most used calculators and those most recently used.

* Support for iPad retina display
* Ability to change default units from English to Metric
* Improved performance and faster page turning
* Minor bug fixes

* Fixed memory issues causing crashes.
* Fixed forward and backward issues on iPhone/iPod Touch.

* Fixed a bug in displaying lists.
* Improved database performance.

* Redesigned interface with increased interactivity.
* 45 new woods
* Ability to email pages
* New reference material
* Calculators with calculator tape

* Added 9 new wood samples
* Improved memory management and bug fixes

* Support for iPad as well as iPhone and iPod Touch
* Improved navigation and search.

* Almost 100 new woods for over 160 wood samples
* New thumbnails sorted by name and shade for faster matching
* New list of all common wood names linked to samples
* New lists of woods by specific gravity and Janka hardness
* Enhanced glossary with over 90 terms
* Higher resolution sample images for almost all woods
* Improved navigation for easier browsing and searching

* Added Janka Hardness Scale for all wood samples.
* Added Specific Gravity information for all wood samples.
* Added Hardwood Lumber Grading information.
* Added Softwood Lumber Grading information.

* Improved full text search
* 10 new wood samples
* Section with just the wood sample to make it easier to identify a wood