Enhancement - #36, #37

- Added features #36 and #37, providing annual versions of the 'history'
  and 'ghistory' command as 'history.annual' and 'ghistory.annual'.
- Uses new canonical names history.monthly, history.annual, ghistory.monthly
  and ghistory.annual, with aliases providing original history and ghistory
  commands.
- Updated man pages.

i18n/strings.en-US

@@ -42,8 +42,8 @@
 210 edit
 211 export
 212 help
-213 history
-214 ghistory
+213 history.monthly
+214 ghistory.monthly
 215 import
 216 info
 217 prepend
@@ -59,6 +59,9 @@
 227 undo
 228 version
 229 shell
+230 config
+231 history.annual
+232 ghistory.annual
 
 # 3xx Attributes - must be sequential
 300 project