New thread sampler webscript needs some css polishing

[AntonioSoler]

I've recently written another tool for the project, this is a "Thread Sampler" that allows to see in a very easy way how a thread is evolving and its stacktraces and states change over time.
This tool uses 2 webscripts, one to get a threadump on json format from the jmx and a second one to display it and also allows you to save and load all the sampler information.

The display css is not great but does its job, on some moments it may cut the end of a line or the scroll bars may appear uglily, I would like to have someone to look at this and review my css here:

https://github.com/Alfresco/alfresco-support-tools/blob/master/src/main/amp/config/alfresco/enterprise/webscripts/org/alfresco/enterprise/repository/admin/support-tools/admin-alfresco-threadsampler.get.html.ftl