Fix to share feature

Under the cover revision

Updated a few images.

* 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
* Six new sea plant profiles
* All land plant profiles have multiple photos
* 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 Retina displays
* All new high resolution graphics for all plants
* Able to email any page
* Improved interface

* Improved memory management and bug fixes

* Added the 4 images that were mistakenly left out of version 1.0.