saturation bug fix.
Some bug fixes, and abs version 0.1
abs ver 0.2
abs v0.3
rounf ver 0.1
round v0.1
mac original version
max and min  test cases added. Also added lab3 pdf
Merge branch 'macdp'
abs test cases added.
Alu_test cases added. Mac test cases pending.
alu and round

Conflicts:
	lab2-3/rtl/mac_dp.vhd
round v0.2
Update mac_dp.vhd

comments on inv_opb
..
Merge branch 'master' of github.com:niketancm/tsea26