minor changes
Merge branch 'master' of https://www.github.com/AndreasFMueller/AstroPhotography

Conflicts:
	control/configure.ac
Merge branch 'master' of https://www.github.com/AndreasFMueller/AstroPhotography
Merge branch 'master' of https://www.github.com/AndreasFMueller/AstroPhotography
Merge branch 'master' of https://www.github.com/AndreasFMueller/AstroPhotography
add boost chrono (for gcc < 4.7)