Merge pull request #1850 from pwielgolaski/jms_group

JMS: log group request time for group statistics
Minor refactoring
Avoid warning 'imported -ws- is permanently hidden by definition of package ws in package action'
In the console summary, don't put an extra line between the request and errors
In the console summary, don't put a space before the percent symbol
As it's mutating the 'var' reference, don't need to also have a mutable collection
Remove mutating var for a more explicit code
More constants for colors
Merge pull request #1851 from excilys/upgradeHighstock

More constants for colors
add drift and fixing group request response time to include also sending part
- also small refactoring and update in test
organize imports