overall whitespace & encoding fixes

patch from Matthias Schwarzott:
- use utf8 everywhere for files & file names

additionally by me:
- remove empty lines at the beginning of the files
- remove any control character (< 0x20) except \n and \t
- remove trailing whitespace
- exactly one newline at the end of the files
- remove junk from dvb-t/au-Melbourne-Upwey

dvb-c/at-SalzburgAG

@@ -7,4 +7,3 @@ C 418000000 6900000 NONE QAM64
 C 426000000 6900000 NONE QAM64
 C 442000000 6900000 NONE QAM64
 C 306000000 6900000 NONE QAM64
-

dvb-c/fi-jkl

@@ -1,4 +1,4 @@
-# OnCable (Finland / Jyväskylä)
+# OnCable (Finland / Jyväskylä)
 # freq sr fec mod
 C 514000000 6900000 NONE QAM128
 C 426000000 6900000 NONE QAM128