Remove option highlight_projects_colors in favor of colorscheme options.

No need to toggle the highlighting of projects and contexts anymore. If
you want to turn it off, simply assign an empty value to the
project/context colors:

  [colorscheme]
  project_color =
  context_color =

topydo.conf

@@ -5,7 +5,6 @@ default_command             = ls
 ; filename                  = todo.txt
 ; archive_filename          = done.txt
 colors                      = 1
-highlight_projects_contexts = 1
 identifiers                 = linenumber ; or: text
 
 [ls]

topydo/lib/Config.py

@@ -44,7 +44,6 @@ class _Config:
             # topydo
             'default_command': 'ls',
             'colors': '1',
-            'highlight_projects_contexts': '1',
             'filename' : 'todo.txt',
             'archive_filename' : 'done.txt',
             'identifiers': 'linenumber',
@@ -118,12 +117,6 @@ class _Config:
         except ValueError:
             return self.defaults['colors'] == '1'
 
-    def highlight_projects_contexts(self):
-        try:
-            return self.cp.getboolean('topydo', 'highlight_projects_contexts')
-        except ValueError:
-            return self.defaults['highlight_projects_contexts'] == '1'
-
     def todotxt(self):
         return os.path.expanduser(self.cp.get('topydo', 'filename'))
 

topydo/lib/PrettyPrinterFilter.py

@@ -56,8 +56,10 @@ class PrettyPrinterColorFilter(PrettyPrinterFilter):
             except KeyError:
                 pass
 
+            # color by priority
             p_todo_str = color + p_todo_str
-            if config().highlight_projects_contexts():
+
+            # color projects / contexts
             p_todo_str = re.sub(
                 r'\B(\+|@)(\S*\w)',
                 lambda m: (