Fix to share feature

Under the cover revision

* Added back button

* Fixed minor problems with iOS13

* Fixing bug that caused some update issues.

* Fixed bug with sharing some pages
* Added support for iPhone X screens

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

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

* 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 the new iPad with all of the images and graphics in high resolution.
* Over 100 boating-related calculators added
* Ability to email any page.
* Complete updated interface

* Improved memory management and bug fixes

* Minor copy changes and corrections.
* Minor bug fixes with bookmarks.

* Support for both iPad as well as iPhone and iTouch
  * Improved search engine and navigation

* Updated proof of citizenship requirements for returning to US and NEXUS information
* Updated OARS Videophone locations
* Added Local Boater Option information
* Updated currency conversion tables
* Updated CANPASS addresses and phone numbers
* Added color images of cloud formations

This version contains:
* Full text search
* Smoother scrolling
* Better memory management