Convert yml2 into a Python package.

* Rename yml2.py    -> yml2/__init__.py
* Rename backend.py -> yml2/backend.py
* Rename pyPEG.py   -> yml2/pyPEG.py
* Use relative imports where appropriate.
* Change imports in yml2c, yml2proc.
* Update make target `clean`.

Makefile

@@ -10,11 +10,11 @@ update: homepage format.css gpl-2.0.txt
 
 update-all: update yml2c yml2.py pyPEG.py backend.py yml2proc
 	if test -z $(VERSION) ; then echo VERSION not set ; exit 1 ; fi
-	rsync -avC *.py yml2c Makefile yml2proc xml2yml.ysl2 standardlib.ysl2 samples dragon:fdik.org/yml2/
-	ssh dragon bash -c "cd ; cd fdik.org/; tar cvjf yml-$(VERSION).tar.bz2 yml2/{*.py,*.yml2,*.yhtml2,format.css,gpl-2.0.txt,yml2c,Makefile,yml2proc,xml2yml.ysl2,standardlib.ysl2,samples} ; rm yml2.tar.bz2 ; ln -s yml-$(VERSION).tar.bz2 yml2.tar.bz2"
+	rsync -avC *.py yml2 yml2c Makefile yml2proc xml2yml.ysl2 standardlib.ysl2 samples dragon:fdik.org/yml2/
+	ssh dragon bash -c "cd ; cd fdik.org/; tar cvjf yml-$(VERSION).tar.bz2 yml2/{*.py,*.yml2,*.yhtml2,format.css,gpl-2.0.txt,yml2,yml2c,Makefile,yml2proc,xml2yml.ysl2,standardlib.ysl2,samples} ; rm yml2.tar.bz2 ; ln -s yml-$(VERSION).tar.bz2 yml2.tar.bz2"
 
 %.html: %.en.yhtml2 heading.en.yhtml2 homepage.en.yhtml2
 	$(YML2C) $< -o $@
 
 clean:
-	rm -f *.html *.pyc *.pyo
+	rm -f *.html *.pyc *.pyo */*.pyc */*.pyo

yml2c

@@ -11,9 +11,9 @@ import sys, os, codecs, locale
 import fileinput, unicodedata
 from optparse import OptionParser
 
-from pyPEG import parse, u
+from yml2.pyPEG import parse, u
 from yml2 import ymlCStyle, comment, oldSyntax
-import backend
+import yml2.backend as backend
 
 def printInfo(option, opt_str, value, parser):
     sys.stdout.write(__doc__)

yml2proc

@@ -18,8 +18,8 @@ except:
     sys.exit(1)
 
 from yml2 import ymlCStyle, comment, oldSyntax
-from pyPEG import parse, u
-import backend
+from yml2.pyPEG import parse, u
+import yml2.backend as backend
 
 def printInfo(option, opt_str, value, parser):
     sys.stdout.write(__doc__)