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The man page now contains the section "MEMORY SIZES" which talks about
the convention used for representing memory sizes and why it was chosen.

Conflicts:
	htop.c
	htop.h

It is now accessible via F6 when on tree view (as a bonus, it is
now also reachable via the mouse). The function bar now dynamically
changes to reflect the toggle nature of the tree-view mode (F5)
and the F6 key serves as expand/collapse when on tree mode,
and its previous behavior of bringing up the "Sort By" menu
(which only made sense on non-tree mode). Users wishing to go to
the "Sort By" menu straight from Tree View can still do so with the
"<" and ">" keys (the top-compatible keys for sort selection).

(thanks to Vincent Launchbury)

plus some fixes

Add CPU affinity screen ('a' key).
BUGFIX: Correct display of TPGID field.
Add TGID field.