Merge 73299,73301,73308 from ^/trunk

------------------------------------------------------------------------
r73299 | jhunold | 2011-07-22 14:08:03 +0200 (Fr, 22 Jul 2011) | 2 lines

Enable visibility support. Refs #2114.

------------------------------------------------------------------------
r73301 | jhunold | 2011-07-22 16:15:45 +0200 (Fr, 22 Jul 2011) | 2 lines

Enable visibility support. Refs #2114.

------------------------------------------------------------------------
r73308 | jhunold | 2011-07-23 11:24:35 +0200 (Sa, 23 Jul 2011) | 2 lines

Enable visibility support. Refs #2114.

------------------------------------------------------------------------


[SVN r73381]

libs/date_time

@@ -1 +1 @@
-Subproject commit 7f89ef42b6b9bb3612d7eb959e9b75022a91e33c
+Subproject commit 2490f1c985d96fe89473032e8f39854b13d86b1c

libs/graph

@@ -1 +1 @@
-Subproject commit 081b1f90bf8ee2953d0681c1ade65a422174f922
+Subproject commit fec3bd231430f4d653adaabe0a7dd79471a21e69

libs/program_options

@@ -1 +1 @@
-Subproject commit cf09cfde1f4a2b6a0195f831184bc8fe11111071
+Subproject commit c054a3b0345c590279bc90b87f3a889b85144fa9