Bump version to 6.3 development

7 jobs for master in 75 minutes and 15 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #7339
Linux
clang-c++11

00:21:23

passed #7341
Linux
clang-c++98

00:18:03

passed #7344
Linux
cppcheck

00:00:26

passed #7338
Linux
gcc-c++11

00:05:20

passed #7340
Linux
gcc-c++98

00:04:58

passed #7342
Apple
macos-c++11

00:10:03

passed #7343
Apple
macos-c++98

00:15:00