Pimp the manpage to create nicer hyperlinks and HTML output

Also, add a target to the makefile to build a flashrom.8.html with groff.
To fix some formatting issues this adds some indention commands as well.

Corresponding to flashrom svn r1913.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
diff --git a/flashrom.c b/flashrom.c
index 113a05b..3853e19 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -1787,7 +1787,7 @@
 void print_banner(void)
 {
 	msg_ginfo("flashrom is free software, get the source code at "
-		  "http://www.flashrom.org\n");
+		  "https://flashrom.org\n");
 	msg_ginfo("\n");
 }