Current directory layout

- bitmap: bitmap library for X Window Bitmaps
- btree: binary tree library
- D: display library
- datetime: DateTime library
- db: database management interface database drivers
	- db/dbmi: general DB driver
	- db/sqlp: SQL parser library for DBMI driver
	- db/stubs: general DB driver
- display: library for CELL driver
- edit: curses library
- external: external libraries
	- external/parson: JSON serialization and deserialization functions
	- external/shapelib: SHAPE file management functions
- fonts: fonts
	- fonts/fonts
	- fonts/for_grass
- front.end: modules front end (cmd or inter)
- gis: main GRASS library
- image: image library required for SG3d/Iris, saving images in SGIs
             rgb-format
- init: GRASS startup scripts and programs
- linkm: linked list memory manager
- ogsf: ported gsurf library (required for NVIZ)
- proj: PROJ4 projection library wrapper
- raster: GRASS raster display library
- vask: Curses based cursor library
- vector: GRASS vector library
	- vector/dglib: Directed Graph Library implementation
	- vector/dglib/examples: Directed Graph Library examples
	- vector/diglib: more GRASS vector functions
	- vector/Vlib: portable GRASS vector functions
