set a default site config of 48 hours walltime, and load it from the siteconfig file
update the siteConfigs to support new default hours
Fix crashes on the new version alert dialog

1) Although I was calling ShowModal from CallAfter (i.e on the
GuiThread) I was creating the dialog on a different thread. This is not
possible, so both creation and show modal are now done from call after

2) The new version Alter dialog used a flexgridsizer with only a single
column and an incorrect number of rows. Switched to a box sizer
remove a key error relating to auth_mode on first use of strudel
Layout changes

Change a radiobox to a combobox for use ssh keys verse use password
change the vertical alignment of various statictext elements so they
don't look quite so odd anymore.
slight improvements to the siteListDialog, buttons right aligned, columns expand when windowsize is changed
show the network fault dialog when the tunnels disapear. Actually this is a little agressive since the dialog will be shown if the session terminates due to walltime as well
Merge branch 'master' of https://github.com/monash-merc/cvl-fabric-launcher
new cvlsshutils
Merge pull request #49 from l1ll1/master

bunch of changes