templating functionality should be more robust w.r.t. percent characters in e.g. description

[boegel]

Currently, a description like:

description = "We are the 99%"

is not accepted in an easyconfig file, it results in an error like:

  File ".../easybuild/framework/easyconfig.py", line 619, in _resolve_template
    value = value % self.template_values
ValueError: unsupported format character 't' (0x74) at index 117

The templates functionality should be made more robust against this, i.e. only take named string templates into account, and auto-escape anything else.

[boegel]

This has been fixed ages ago in the resolve_template function that is used to resolve templates...