Update buffer.c
Update buffer.c
Update createtable.c
Create createtable.h
Update describe.c
Create describe.h
Create showtable.c
Create showtable.h
Create select_col.c
Create select_col.h
add new files
Merge branch 'jingo' into chingfan

Conflicts:
	src/buffer.c
	src/createtable.c
	src/createtable.h
	src/describe.c
	src/describe.h
	src/select_col.c
	src/select_col.h
	src/showtable.c
	src/showtable.h