fixed much of string formatting

[RiedleroD]

I used inline format strings where necessary, because:

• Inline format strings are about twice as fast as old-style format strings
• Inline format strings take about 2/5 the time of new-style format strings
• conactenation takes pretty much the same time when less variables are used, but the time rises drastically with variable count.
• also many people find inline format strings a lot more readable than any of the options above, and I'm one of those people.

inline → f"{v1} {v2}" new → "{} {}".format(v1,v2) old → "%s %s"%(v1,v2) concat → v1 + " " + v2 (assuming v1 and v2 are strings)

Also I fixed some weird path formatting & fixed possible infinite path strings (use os.path.dirname(odir) instead of os.path.join(odir,".."))

Also also I replaced some iconcat forloops with .join() because that's faster, more readable, and way less code.

[cooperdk]

I totally agree that inline string formatting is best. Some places I forget about then and just write a long print ("xxx" + xxx + " yyy " + yyy) statement... thanks for the corrections :-)

[RiedleroD]

I would've checked if everything still worked before merging, but ok. I didn't check if I made any errors because I was just too exhausted from going through thousands of lines of code. I'm pretty sure I broke at least a few things.