Corrected calculation of reference source point.  This allows the 
background to stay constant when blinking through observations of the 
same source.
Merge branch 'master' into issue15
Note 1 in the accept source dialog now gets focus when the dialog is 
created.  Also, the note 1 and note 2 comboboxes are no longer read only ;
any value can be entered in them.  Therefore the offered choices are 
mostly for reference when the user is still learning.
Add flot (JS query library) as ossos.flot to provide interactive plotting functionality. Some tweaks also to queries for triplet information.
added authentication
Added custom combo box class which is read-only but allows keyboard
completion of the possible choices by pressing the first character of the
choice.
This addresses the issue in #14 by keeping the possible values restricted
while still facilitating the keyboard workflow.
Merge pull request #22 from drusk/issue15

Issue15 - Keep background steady
Merge pull request #23 from drusk/issue14

Issue14 - Note 1 focus