recipe_prepare_recipe_logs.py: can incoroporate multiple DT_Log files
remove readout pattern with hori=True
Merge remote-tracking branch 'origin/test-hori'
products.py: remove dependency on pyftis
publish-html save json files
publish-html support a0v-onoff & stellar-onoff
fix spec2d output have larger number of orders
update header for recipe_*.tmp
do not ensure directory for INDATA_PATH
Merge branch 'v2.0' into interpolate

Conflicts:
	libs/products.py
	recipes/recipe_extract.py
further fix for INDATA_PATH
use factory function to generate extract-related recipe functions
debuging info is saved only when debug_output is True