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.

python-mock/PKGBUILD

@@ -12,7 +12,7 @@ makedepends=('python2' 'python3')
 license=('BSD')
 arch=('any')
 source=("https://pypi.python.org/packages/source/m/mock/mock-$pkgver.tar.gz")
-md5sums=('c3971991738caa55ec7c356bbc154ee2')
+sha256sums=('b839dd2d9c117c701430c149956918a423a9863b48b09c90e30a6013e7d2f44f')
 
 build() {
   cd "$srcdir"