require python >2.6
fixed a rounding error problem
removed a debugging statement
fixed a test
fixed a test
added a test
quiet some test
changed warning about changed traces to a debug message
prevent a runtime warning
automatically build prerequisites from setup.py
delay import of evalresp_ext into evalresp function
added test runner script
remove obsolete import
docs: improved installation manual
Merge branch 'master' of git://github.com/HerrMuellerluedenscheid/pyrocko into HerrMuellerluedenscheid-master

Conflicts:
	pyrocko/trace.py
doc of save_markers
traces created from scratch hold self.file=None
modified documentation of save_markers
Revert "traces created from scratch hold self.file=None"

This reverts commit cdc900dc899f2e89f446a8794974516a0c0447f4.