Add more WebOPAC.net libraries

I updated the Python script and added four Google results pages of WebOPAC.net libraries. I tested some of them at random,
After I added those 31 libraries, I saw that Google hid similar results and when I showed them, I saw that there are in fact 232 libraries! If we want to add all of them, I think we need to automate that task more.

Additionally, I fixed a bug in PICA, where it only determined if the library supports accounts by looking at if the tag `accountSupported` is there, ignoring its value.
And I updated WebOPAC.net to use URLs without trailing slash in the JSON file.