Working on the preferences chapter and related topics
Some corrections in the readme file.
Removing trivial conrefs

These conrefs were trivial -- just a few lines resued once and they were
triggering the issue #38 problem. Put note on both topics that were were
describing some settings in common.
Untangling a spaghetti web of xrefs and conrefs contributing to issue #39
Removing profiling from other issue #39 xrefs
Merge branch 'dev'

* dev:
  Removing profiling from other issue #39 xrefs
  Untangling a spaghetti web of xrefs and conrefs contributing to issue #39
  Removing trivial conrefs
  Some corrections in the readme file.
  Working on the preferences chapter and related topics

Conflicts:
	DITA/topics/preferences-editor-text.dita
	DITA/topics/preferences-editor.dita
Solved manually.