GUAC-933 Fixed connection history formatting, connection parameter saving, and create new connection view.

Technically, this ```&&``` in the attribute needs to be ```&amp;&amp;``` ... which is probably a sign that this should be done differently, without such logic in the template.

Regardless of the ```&``` vs ```&amp;```, it seems odd that the template should need to be aware that ```duration``` will only be available if ```endDate``` is specified, etc.