Further work on database.
consolidate solutions and autosave tables into solutions table.
Drop java-specific tables activity_logs, unsolutions,
Re-vamp server scripts for Javascript version.
Update associated documentation.  Code has not been
tested, yet.
Added session id handling.
Server side scripts now mostly working.
client side js/load-save.js now mostly working, except for
last example in www/js/json/test.html
Add timestamp to log messages.
Moved example problem from www/js/json to problems directory.
Set up login page.  Can sucessfully start up a session and load
a model from the server into js/main.js
Clean up integration of charts and tables a bit
still need to move associated js out of index.html to
js/main.js
Authored problem issue
Updates to folders and paths; removed unneeded code.
Equation comparison--in progress.
Move set up for solution chart out of index.html to js/main.js
Merge branch 'master' into megha2