Massive overhaul of "generate project" feature

previous incarnation was woefully lacking.  new feature is much more
extensible.  still need to remove old POS integration specifics in
some places.

and a couple of unrelated things that snuck in..

- deprecate `rattail.util.OrderedDict`
- deprecate `rattail.util.import_module_path()`
- deprecate `rattail.util.import_reload()`

tailbone/forms/core.py

@@ -26,6 +26,7 @@ Forms Core
 
 import json
 import logging
+from collections import OrderedDict
 
 import sqlalchemy as sa
 from sqlalchemy import orm
@@ -346,6 +347,7 @@ class Form(object):
         self.schema = schema
         if self.fields is None and self.schema:
             self.set_fields([f.name for f in self.schema])
+        self.grouping = None
         self.request = request
         self.readonly = readonly
         self.readonly_fields = set(readonly_fields or [])
@@ -371,6 +373,7 @@ class Form(object):
         self.validators = validators or {}
         self.required = required or {}
         self.helptext = helptext or {}
+        self.dynamic_helptext = {}
         self.focus_spec = focus_spec
         self.action_url = action_url
         self.cancel_url = cancel_url
@@ -404,6 +407,9 @@ class Form(object):
         return get_fieldnames(self.request.rattail_config, self.model_class,
                               columns=True, proxies=True, relations=True)
 
+    def set_grouping(self, items):
+        self.grouping = OrderedDict(items)
+
     def make_renderers(self):
         """
         Return a default set of field renderers, based on :attr:`model_class`.
@@ -728,11 +734,15 @@ class Form(object):
         """
         self.defaults[key] = value
 
-    def set_helptext(self, key, value):
+    def set_helptext(self, key, value, dynamic=False):
         """
         Set the help text for a given field.
         """
         self.helptext[key] = value
+        if value and dynamic:
+            self.dynamic_helptext[key] = True
+        else:
+            self.dynamic_helptext.pop(key, None)
 
     def has_helptext(self, key):
         """
@@ -935,7 +945,10 @@ class Form(object):
             # TODO: older logic did this only if field was *not*
             # readonly, perhaps should add that back..
             if self.has_helptext(fieldname):
-                attrs['message'] = self.render_helptext(fieldname)
+                msgkey = 'message'
+                if self.dynamic_helptext.get(fieldname):
+                    msgkey = ':message'
+                attrs[msgkey] = self.render_helptext(fieldname)
 
             # show errors if present
             error_messages = self.get_error_messages(field) if field else None