textual: fix some typos and inconsistencies in various messages

Fixing plain typos, miswordings, inconsistent periods, some missing
angular brackets, and a proper pluralization (even when it involves
a constant, because for some languages the precise value matters).

Signed-off-by: Benno Schulenberg <bensberg@justemail.net>
build-sys: fix switch_root/pivot_root cut-n-paste error in configure.ac

The "linux only" check for pivot_root seems to suffer from
a cut-n-paste problem from the earlier switch_root part.

Signed-off-by: Andreas Henriksson <andreas@fatal.se>
libmount: don't use /{proc,ext}/filesystems when more fs types specified

 # mkfs.ext4 /dev/sda1
 # mount -t foo,bar /dev/sda1 /mnt

successfully mount the device, this is unexpected as extN is no
between wanted (by -t specified) filesystems.

Summary about -t:

 * "mount -t foo"        mount(2) with "foo" type

 * "mount -t foo,bar"    try mount(2) with "foo" or "bar"

 * "mount -t foo,auto"   try mount(2) with "foo" or ask libblkid for
                         the type

 * "mount -t nofoo,bar"  try types from /{etc,proc}/filesystems, but
                         exclude "foo" and "bar"

Note that more filesystems may be specified in fstab (as comma
delimited list). The stuff from fstab is always interpreted as list
and never as a pattern ("no" prefix makes no sense in fstab).

Reported-by: Benno Schulenberg <bensberg@justemail.net>
Signed-off-by: Karel Zak <kzak@redhat.com>
tests: add mount -t test

Signed-off-by: Karel Zak <kzak@redhat.com>
mount: clean up -t info in mount.8 and fstab.5

 * remove the huge and unmaintained list of filesystems, just keep
   only very basic FS types in the man pages

 * add info about command delimited lists to fstab.5

Signed-off-by: Karel Zak <kzak@redhat.com>
cal: add const function attributes

Reference: http://lwn.net/Articles/285332/
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
cal: prefer defined constant rather than magic values

Signed-off-by: Sami Kerola <kerolasa@iki.fi>