+20200215
+ + improve manual page for panel library, extending the portability
+ section as well as documenting error-returns.
+ + show tic's version when installing terminal database in run_tic.sh
+ + correct check for gcc vs other compilers used in ncurses 6.0, from
+ FreeBSD patch by Kyle Evans (cf: 20150725).
+ + add notes for 6.2 to INSTALL.
+