Mike Fleetwood authored Feb 05, 2023 and Curtis Gedak committed Feb 13, 2023

Move common testing code which doesn't need linking with GParted objects
into the common module.  Move the remaining common code used to print
GParted objects using the insertion operator (operator<<) into the
insertion_operators module.  Split the common code like this so that the
operator<<(std::ostream&, const OperationDetail&) function is not
included in test_PipeCapture and it is not forced to link with all the
non-UI related GParted objects.

The Automake manual provides guidance that when a header belongs to a
single program it is recommended to be listed in the program's _SOURCES
variable and for a directory only containing header files listing them
in the noinst_HEADERS variable is the right variable to use [1].
However the guidance doesn't cover this case for common.h and
insertion_operators.h; header files in a directory with other files and
used by multiple programs.  So just because we have gparted_core_OBJECTS
(normal Makefile, not Automake special variable) listing objects to link
with, choose to use noinst_HEADERS Automake variable to list needed
headers.

[1] GNU Automake manual, 9.2 Header files
    https://www.gnu.org/software/automake/manual/html_node/Headers.html
        "Usually, only header files that accompany installed libraries
        need to be installed.  Headers used by programs or convenience
        libraries are not installed.  The noinst_HEADERS variable can be
        used for such headers.  However, when the header belongs to a
        single convenience library or program, we recommend listing it
        in the program's or library's _SOURCES variable (see Defining
        program sources) instead of in noinst_HEADERS.  This is clearer
        for the Makefile.am reader.  noinst_HEADERS would be the right
        variable to use in a directory containing only headers and no
        associated library or program.

        All header files must be listed somewhere; in a _SOURCES
        variable or in a _HEADERS variable.  Missing ones will not
        appear in the distribution.
        "

Closes #220 - Format to Cleared not clearing "pdc" ataraid signature