hide diam calc total field when only one trunk

fixes #655 on github.

Instead of having a readonly input field, the input field used for the inlineEditForm is now totally hidden. In addition, there is a input field underneath the worksheet that will show the total when multiple trunks are added.
Fix failure to enable fields after "add another tree"

The marker was being recreated but its 'dragend' handler wasn't being reset.
Solution is to only create the marker once, and only enable its dragend handler once.
That also allows simplifying the code by removing bindMarkerEventsOnce().

Also:
* Unbind popup when leaving browseTreesMode so it won't reappear
* Patch Leaflet so it won't crash
Simplify plotMarker.js

`addMarkerToMap`:
* Rename as `onMarkerPlacedByClick`
* Don't export, as it's not referenced externally
* DRY it out by calling onMarkerMoved(), which does exactly what the removed lines do

Also:
* Remove markerPlacedByClickBus (and its exported name markerPlacedByClickStream) are currently unused (`markerPlacedByClickStream` was referenced in addTreeMode.js, but so is `markerFirstMoveStream` and that will
have an event whenever the other would have.)
Allow '@', '.', '+', and '-' in url names for users
Merge pull request #774 from ahinz/fix/allow-periods-in-username

Allow '@', '.', '+', and '-' in url names for users
Merge pull request #773 from steventlamb/bug/655/diameter_calculator_total

hide diam calc total field when only one trunk
Use more permissive url pattern (allow @.+=) for user profile.

PR #774 addressed this for the instance-level urls which redirect to the
site-wide user profile, but missed the urls for the site-wide user profile.
Merge pull request #778 from maurizi/master

Use more permissive url pattern (allow @.+=) for user profile.
Merge pull request #777 from RickMohr/fix-add-another-tree

Fix "Add another tree"
Fix template typo: isntance -> instance

fixes #775 on github.

The 'Move Tree' button data-always-enable attribute was always being set to "False" because of this typo, causing the button to remain disabled by the buttonEnabler.
Merge pull request #783 from steventlamb/bug/775/disabled_move_tree

Fix template typo: isntance -> instance
Hide readonly field on plot_detail

fixes #772 on github.
Merge pull request #784 from steventlamb/bug/772/hide_readonly_field

Hide readonly field on plot_detail
Merge pull request #785 from ahinz/topic/add-on-map-page-selenium-tests

Topic/add on map page selenium tests
lint
Refactor create instance function
Add in tests 'add another with ___' options