Sherpa Prototype

First attempt to add a toolkit of buttons to the program view. These will be used later to add / del lines in the sources
still very much draft all this stuff right now

Expressions & lvalues are editables in program
no validation yet
need refactoring to be done pretty soon

Small Steps; preparing to make parts of program's view editables. The renderProgram function is now preparing the view inside a programView variable inside org.sherpa.program.view. This allows to no longer rely on the return values

Just making sure all editables are highlighted in yellow when hovered to make it easier for the user to spot these fields

Adding variables implemented

Redid layout for test so descriptions are before the last.
Added delete button for all variables in the header view
Hooked the buttons to new org.sherpa functions which remove variables from the header & tests models after verifyign the variable is not used in the program's body. Added a tmp variable "even" to myprogram.js so we test removing "even" when "nbeven" is there. need to not try to match sub-words when looking for varname

addNewTest in sherpa.js is now adding either a dup of the last test, if any, or a new test with zeroes everywhere

Both divs used to display results of running program are now in the "Run Tests" tab. A button allows to start the execution / refresh the data presented there. The program is no longer ran every time page_reloaded is executed. This allows for entering stupid values, e.g. variable initializations, without freezing the browser due to an infinite loop.

Adding a dummy test from the view is now possible

Able to remove tests from tests' view