Add properties.[ch] to lib/report, defined based on columns.h.

Extend the existing reporting infrastructure definitions and structures
to include a 'get' and 'set' function for each field.  We will provide
a 'get' and 'set' function for each of these fields, which will be utilized
by exported lvm2app functions.

Define a default _not_implemented 'get' and 'set' function that just sets
an errno and returns 0.  Future patches will actually implement the
specific 'get' and 'set' functions for each property.  For read-only
properties, only the 'get' function will be implemented.

Define vg_get_property() function to query a property.  We will call
this from a lvm2app function.

include/.symlinks.in

@@ -50,6 +50,7 @@
 @top_builddir@/lib/misc/lvm-version.h
 @top_srcdir@/lib/misc/lvm-wrappers.h
 @top_srcdir@/lib/misc/sharedlib.h
+@top_srcdir@/lib/report/properties.h
 @top_srcdir@/lib/report/report.h
 @top_srcdir@/lib/uuid/uuid.h
 @top_srcdir@/libdm/libdevmapper.h

lib/Makefile.in

@@ -90,6 +90,7 @@ SOURCES =\
 	misc/lvm-wrappers.c \
 	misc/util.c \
 	mm/memlock.c \
+	report/properties.c \
 	report/report.c \
 	striped/striped.c \
 	uuid/uuid.c \