Since Ceres is moving to using GitHub for issues, and the Google
Code URL in the current copyright header will soon become invalid,
update all the headers.
Change-Id: I1fce70375d1bcf098591f07b4d8f01a5c1e0789c
In some cases there were missing includes of own
header files from implementation files.
In other cases moved function which are only used
within single file into an anonymous namespace.
Change-Id: I2c6b411bcfbc521e2a5f21265dc8e009a548b1c8
Keir Mierle