tmac: rename IM (italic manual) to MR (manual reference) Suggested by G. Brandon Robinson.

tmac: introduce real manual reference macro instead of overloading IR The overloading of IR emits magic \X'...' sequences that turn into HTML manual links. But not all such IR invocations should be manual links; those had to be written to avoid the IR macro before. Worse, the \X'...' ending the IR causes troff to emit only a single space after a period. Defining a new IM macro for manual references fixes both problems. Fixes #441.

libdraw: redo default font construction to be hidpi-safe If $font is not set, the default font is constructed from font data linked into every libdraw binary. That process was different from the usual openfont code, and so it was not hidpi-aware, resulting in very tiny fonts out of the box on hidpi systems, until users set $font. Fix this by using openfont to construct the default font, by recognizing the name *default* when looking for font and subfont file contents. Then all the hidpi scaling applies automatically. As a side effect, the concept of a 'default subfont' is gone, as are display->defaultsubfont, getdefont, and memgetdefont.

man: document font syntaxes Change-Id: Id441d4df192c47388af6b5da306f14d90f066d18 Reviewed-on: https://plan9port-review.googlesource.com/1173 Reviewed-by: Russ Cox <rsc@swtch.com>

libdraw: autoscale fonts when moving between low and high dpi screens Change-Id: I6093955b222db89dfe437fb723593b173d888d01 Reviewed-on: https://plan9port-review.googlesource.com/1170 Reviewed-by: Russ Cox <rsc@swtch.com>

libdraw: add scalesize R=rsc http://codereview.appspot.com/6855092

Many small edits.

use macro for /usr/local/plan9

Some man pages.

Mostly path name updates

Rewrite page(2) references to page(3). Add description of new libmach.

Lots of man pages.