Bump version number, update NEWS file and copyright notices.

If gfsec-split is to create a configuration file in the "standard"
configuration directory ($XDG_CONFIG_HOME/gfsecret), make sure
that directory exists.

Closes #6

Make gfsec-split fallback to $HOME/.config if the XDG_CONFIG_HOME
variable is not set, as gfsec-use already does and as requested by
the XDG Base Directory Specification.

Also apply the fallback if the variable is *defined* but *empty*.

References #6

Make sure libraries are mentioned last on the linker's command
line. Do not use LFDLAGS as a substitute for LIBS.

Thanks to Thomas Perret.

Closes #3

Somewhat pedantic, but it keeps lintian happy.

Closes #7

Thanks to Thomas Perret for pointing those out.

Closes #5

According to both man(7) and man-pages(7), the .TH command expects
the section number before the date, and optionally the manual name
as the last argument.

Closes #4

Closes #3

Bump version number, update NEWS file and some copyright notices.

When printing the list of available supports, make sure the
descriptions are aligned on the same column.

This macro is needed by autopoint to copy Gettext files when
re-generating the build system.

Fix typo and some missing words.

The strchrnul function is a GNU extension and as such is not
available everywhere.

Prevent configure from aborting if LibMTP or GIO cannot be found;
those dependencies are optional and gfsecret can be built without
them.

Explicitly include the errno.h header in units where errno is
used.

This file should have been committed since the very beginning,
but I somehow completely forgot it...

Add new string and fix some typos.

If the configuration file we were about to write already exists,
ask the user whether we should overwrite it, and proceed or abort
accordingly.

The manual referred to 'gfsec-split-use' instead of the correct
'gfsec-split-gpg'.

Make sure the script will properly recognize the gpg binary for
GnuPG > 2.1.

Before actually splitting the GnuPG private key, print some
infos about the key and ask the user if we should proceed.

This script is intended to help the user to split her primary
GnuPG private key.

We need to keep the secret structure around until we have called
the destroy command, if any.

Part of the code allowing to select a menu entry failed to
acknowledge that menu entries are numbered starting from one,
not zero.

Incenp-bug-id: 9

If the user specified a delete command using --destroy-cmd option,
call that command at the end to delete the original secret.

These options allow to specify the RESTORE and DESTROY commands
to write to the configuration file, to be later used by gfsec-use.

Add an option to override the default location where the secret
should be reconstructed.

The write_file function could return an un-initialized variable
if the fopen call failed for any reason.

Complete gfsec-use's man page with a description of the
restore/destroy-cmd options, and the corresponding keywords
in the configuration file.

Gfsec-use can read the commands to execute to restore and
destroy the secret from the configuration file.

These options allow the user to automatically call another
program when the secret has been reconstructed and when it
should be destroyed.

Incenp-bug-id: 8

Do not report success if anything fails *after* the secret file
has been split or reconstructed.

Allow use of gettext for I18N support. Mark all user-visible
strings as translatable.

Apply coding style rules: remove braces around 1-statement block.