Based on patch from: Roman Zippel <zippel@linux-m68k.org>

The search functionality has been improved:
- Restructured printout with more info
- Include value of relevant symbols
- Improved handling of corner cases
- Generic search support moved to backend - ready to be utilised by xconfig and gconfig
- Search functionality moved to fronend - not hardcoded in menubox.c

Sample search (^$ used to limit search):
Search for "^USB_STORAGE$":

Symbol: USB_STORAGE [=y]
Prompt: USB Mass Storage support
  Defined at drivers/usb/storage/Kconfig:7
  Depends on: USB
  Location:
    -> Device Drivers
      -> USB Support
  Selects: SCSI


Some symbols has loong "Depends on:" lines - for example FW_LOADER.
Use arrows to scroll horisontally to see full value.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>