switch to sha256 checksums

* upgrade some broken packages
* correct some broken urls/checksums
* use secure urls where possible
* use stable url for ncurses
* some whitespace fixes

Remaining md5sums either didn't download or
didn't pass checksum tests.

perl-Algorithm-Diff/PKGBUILD

@@ -11,7 +11,7 @@ groups=('perl-modules')
 depends=('perl')
 license=('GPL' 'PerlArtistic')
 source=("http://search.cpan.org/CPAN/authors/id/T/TY/TYEMQ/${_realname}-${pkgver}.tar.gz")
-md5sums=('0e8add21a641b8d66436df0c2024bf3b')
+sha256sums=('30e84ac4b31d40b66293f7b1221331c5a50561a39d580d85004d9c1fff991751')
 
 build() {
   cd ${_realname}-${pkgver}