#69 Insert text using status line generation macros

[Jiri Gabriel]

I need inserting actual date/time/filename/enviroment
variable in macros.
For insert actiual date i use this macro
:def mfgdate txt,"`%dd.%dm.%dY"
For actual filename
txt,"`%n"

For enviroment variable:
txt,"`%Evarname%"

[Jiri Gabriel]

Patch for text insering enhancement.