Put the kernelside rump kernel headers into <rump-sys> instead of
sprinkling them around the faction directories. Avoids having
to add a CPPFLAGS (or several) to pretty much every component
Makefile.

Leave compat headers around in the old locations.

The commit changes some autogenerated files, but I'll fix the
generators shortly and regen.

Add a COMMENT describing what each component roughly does.

"make describe" prints the comment.

Requested/inspired by Vincent Schwarzer on rumpkernel-users

branches: 1.8.6;
rename component.c -> syspuffs_component.c

branches: 1.7.8; 1.7.18; 1.7.22;
remember to add the new file to the build

Make putter its own component: rumpdev_putter. It was coupled in
with rumpfs_puffs for prehistoric reasons which are no longer valid
(namely, only fs components existed back then and there was no /dev
support in rump fs namespace).

add component constructor to create /dev/puffs -> putter symlink

branches: 1.4.2; 1.4.4;
Adjust rump sources for external/internal interfaces.
No functional change.

Install rump libraries and utilities to the base system and remove the
private non-installed build infrastructure from sys/rump.

breakdown of commit:
* install relevant headers into /usr/include/rump
* build sys/rump/librump/rumpuser and sys/rump/librump/rumpkern
from src/lib and install as librumpuser and librump, respectively
+ this retains the ability to test a librump build with just the
kernel sources at hand
* move sys/rump/fs/lib/libukfs and sys/rump/fs/lib/libp2k to src/lib
for general consumption, they are not kernel-space dwellers anyway
* build and install sys/rump/fs/lib/lib$fs as librumpfs_$fs
* add chapter 3 manual pages for rump, rumpuser, ukfs and p2k
* build and install userspace kernel file system daemons if MKPUFFS=yes
is spexified
* retire fsconsole for now, it will make a comeback with an actually
implemented version shortly

branches: 1.2.2; 1.2.4; 1.2.6; 1.2.12; 1.2.16; 1.2.18; 1.2.20; 1.2.22;
fix build for OBJDIR case. noticed by plenty

branches: 1.1.2;
Add the ability to run puffs in userspace. This means that puffs
can now be developed in userspace using puffs for development
(I hate emulators, they are annoyingly clumsy).

To e.g. mount psshfs using puffs-on-puffs, run fs/bin/syspuffs/syspuffs
with the regular mount_psshfs command line as an argument:

golem> ./syspuffs /usr/sbin/mount_psshfs ftp.netbsd.org:/pub /puffs

This will make the mount appear as usual, with the exception that the
requests will be passed through puffs both in the kernel and userspace:

ftp.netbsd.org:/pub on /puffs type puffs|p2k|puffs|psshfs