Link dynamically by default

MKDYNAMICROOT is still kept at no, since our shared libraries
are in /usr/lib and we need the binaries from the root file
system in order to mount /usr...
Ramdisk makefile update

Use `cp -p` instead of ${INSTALL} or ${HOST_INSTALL_FILE}
Use directly the password database from where it is generated
Simplify the Makefile (WIP)
Memory: do not rebuild the ramdisk over and over

While here, reduce Makefile
Updating hdboot stage

Allow to find the just-built binaries in a more generic way
(the same as done usually with NetBSD code.)
Convert shell instructions to makefile syntax.
Drop obsolete code from mkboot.
Do not play with file systems if using DESTDIR.
Update_bootcfg: Updated

Manual page.
Added several options.
Ability to remove a broken minix_latest,
and to fix it to point to the real latest still on disk.
Dropped INHERIT stuff, following idea from David.
Sorted out the mix between / being the bootdir
and ROOT being the device name for the root file system;
this allows to deal correctly with root FS on RAM disk.
sys/lib/libz: align with NetBSD
libm Makefile: typo (from NetBSD)
libsys: fix building the shared library
libc: make MINIX assembly code position-independent

While here, simplify ucontext.S
libc/i386: add 80-bit long double support functions

Used in rare yet legal cases (conversions from long double to uint64_t)
On NetBSD with clang, libgcc is used silently, but it does not exist
always on MINIX.
While here, fix a glitch on NetBSD source where the code is #ifdef'd
with __i486__, while __i386__ is the symbol to test for.
libminlib/i386: cleaning on assembly code

read_host_time_ns() which is a VMware-specific extension, presently unused,
is given its own file in order to give it more exposition
Configfile library moved into service+dhcpd

... which are the 2 only "users" remaining...
fsck_ext2: fix a small bug about e2d_type
While here, also actually check e2d_type...
Boot_monitor: names on disk without \0

On-disk names with ext2fs and minixfs are not null-terminated,
unlike the original FFS design.
Boot_monitor: implement load_mods for ext2fs

While here, also implement it for ufs, ffs*, and lfs*
i386/system::cpu_info: fix to compute model
kernel: cleaning on assembly code

Throwing out some obsolete tests and variables
Functions smp_get_* which were not used and were not performing the
same as their documentation are retired; _cpuid() is a
convenient replacement anyway
VMWare poweroff magic cli;hlt sequence
VMWare poweroff magic cli;hlt sequence, improved