Fixing bug which would reference an unbound local variable. Should reference "self.visibility" instead of visibility.

--HG--
extra : transplant_source : E%10%AA%AD%85%E2%FE%FA%E0%3C%D6%5D-%FE%CB%1D%0B%93%FB%8E

--HG--
extra : transplant_source : %1A%FE%E6%E5%EA%7D%FAx%BF%0AV%BCVmb%E0%16%B2i%91

--HG--
extra : transplant_source : %F0%20%BAV%24%00%11%F5V%D9%E3%3C%8A%BC%9F5%22%A4%BD%8F

--HG--
extra : transplant_source : %CCQr%12%0AY%10%1F%DA%5D%CD%7C4%C8%CA%B4%90%81%3Er

--HG--
extra : transplant_source : %B9%E5%B2%13%F4w%85_%9C%AF%40Mp%10%BC%D2%99%F2Z%F5

--HG--
extra : transplant_source : %BE%16%1F%87%F9%0E%BC%17R%21%E3%23%A967%81%5C%7B%0E%5C

--HG--
extra : transplant_source : %A2%2B%60%5Ea%F2%EF%24%EE%12%DD%B0pw%13%7F%1C%7Bt%60

--HG--
extra : transplant_source : %983%5Bf%94%87%04%1D%ABS%A2%A2%F1%FA%AEp%95h%A1/

--HG--
extra : transplant_source : %D0%C1g%D5%EA%CE%FE%C36%A5%28%D25J%DF%AD%FB%A3%A3%B2

--HG--
extra : transplant_source : %C8%BB%92%E3%5E%B7%C3z%7B%BA-%17%9D%2AA%ABO%84q%B7

--HG--
extra : transplant_source : %3C%F8.%D8.%9C%C3%DD%C7%7C%B2%CAo%16%FAg%F2%40%04%C4

we use relative filenames for files in the directory itself or
subdirectories, absolute paths otherwise.

this makes cython compatible with emacs compilation mode.

--HG--
extra : transplant_source : %9E%2A%91%5E%84%8Ah%B2_%E5%89%E3-%BA%EE%FBc%08%03o

--HG--
extra : transplant_source : o%16%9CO%21%92o/B%3E%E5%D9%F9%C35%A6%E3%23N%F8

--HG--
extra : transplant_source : %27mb%12_V%3D%F4%A3%B2%03%DC%1Ew%F1%23%B8P%A4Q

--HG--
extra : transplant_source : %B1-f%40%DD%BE/jp%D6%1F%C8I%9C%C3%7D%7DL%FC%00

--HG--
extra : transplant_source : %3B%5E%DB%0F%DF%E6%1BBfk%5D%071Pl%EB%92%93X%A3

--HG--
extra : transplant_source : 1j%D4%9D%A7%13%C5%86%22%B9%9E%2C%7F%90%A3%01o%02%CE%2C

--HG--
extra : transplant_source : %C3%15%11%60%5D%00%F0%D2%FC%28%C8KdS%C9%3D%EC%9Bn%00

--HG--
extra : transplant_source : %B7Vz%D9%E7%DB%81%D5R%DA%91%FC%01%AA%7B%91%91%D6%FD%93

--HG--
extra : transplant_source : %B7i%C3h-%DD%E1d%14B%C3%924%07%2B%83%EF%F3%98s

--HG--
extra : transplant_source : L%3A%00/%B9%85%14%5CE/%C3%3A%A0%A4z%1C%2C%08%F2%C9

--HG--
extra : transplant_source : %05%25%06%D81g%C21%BB%0Fj%D5%C9%82%A4%8E%28%C9lA

--HG--
extra : transplant_source : %E1%3AR%19%8F%A3%8D%95%A1U%10%09%9B%90%FEZ%28p%9C%2C

--HG--
extra : transplant_source : %CB%09%5D%F7%EE%E8X%EC%99%11%EAJi%A0%DB%05%AA%B1%E6%C1

--HG--
extra : transplant_source : H%DE3%F2v%D8v%87%9EO%12%E6J%FC%25q%1C%08%BF2

--HG--
extra : transplant_source : T%DD%B0%DA%C6.i%FF7%E9%28%F6%90%11%DC%CC%FA%D8jc

--HG--
extra : transplant_source : %C7%85%EE%A9%08%C7%25%E4%87%9D1%8E%C6%E4%96%C2%D7%CA%05%3C

--HG--
extra : transplant_source : %08%E9%18%14%FC%D4vh%E5%83%B8fk%AE%C17%1D%9C%C8%5B

--HG--
extra : transplant_source : .s%EEX%17%DE%E8%5Cz8%D799%B5%9E%3E%A3%3D%90%22

--HG--
extra : transplant_source : c%D4%7B%F2%21q%A8_%BD%3F%EE%E6K%EF%3Db%E6%AB%B4Y

--HG--
extra : transplant_source : N0%13bMy%C5%0E%7E%20F%84%9A%F9e%A7%CE%C5%A4%8A