* Implement generation of simple kernels
This commits implements mean and
Gaussian kernel generators,
roughly documents them, and has
tests. But tests for Gaussian have
accuracy problem
* Use difference for testing Gaussian
This commit applies percentage based
difference check on generation of
Gaussian kernels, as exact values are
dependant on platform. The error margin
is set to 5% in this commit
* Remove debugging code
In simple_kernels.cpp, there was
some debugging code, mostly streams
related stuff and commented out code,
which is now removed.
* Address review comments
This commit adds inline to kernel
generator functions, uses
std::ptrdiff_t instead of long int,
resolves some conversion warnings
and does small cosmetic changes
* Remove useless iostream include
There was stray include from debugging
code, now removed
* Use \code and \endcode for formula
This commit applies formatting to
formula of normalized mean
* Change are_equal to is_equal
Change a function name in
simple_kernels.cpp test
* Remove redundant function
In simple_kernels.cpp test there was
a function that was not used at all,
now removed
* Cosmetic changes
Mostly opening brackets moved
