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Fix several FreeBSD compilation errors

`Process_new_fn` had been renamed to `Process_New` in
d880def0

Several functions and struct had changed in
b291fba0

Closes #185.
Closes #190.

Read OOM data only if column is enabled.
Make sort ordering more consistent. Closes #182.

Conflicts:
	Process.c
	Process.h
	htop.c
	linux/LinuxProcess.c
	linux/LinuxProcess.h
	test_spec.lua

A list of functionality to go through and test before releases.

Conflicts:
	Panel.c
	htop.c
	htop.h

Conflicts:
	htop.c
	htop.h

Fixes #174.

Conflicts:
	Panel.c