Initial checkin for fouriertech class.  This class works for smooth periodic functions on [-pi,pi).
Implemented more methods for the initial fouriertech class.
More work on getting the functionality of chebtech into fouriertech
Modified code to handle the case when there is an even number of samples of the function.
Renamed fouriertech to fourtech as per LNT wishes.
Changed FOURIERTECH to FOURTECH and fouriertech to fourtech.  fourtech is the new name.  Added cumsum and fixed some bugs in diff.
Fixed some bugs with diff.
Fixed cumsum to properly handle the case when the number of coefficients is even.
Merge branch 'development' into feature-fourtech
Adding in Fourfun2 and QR for Fourtech. Everything needs tidying up.
First attempt at getting convolution working (not quite there yet).
Added a plot of the strip of analyticity.
Merge branch 'feature-fourtech' of https://github.com/chebfun/chebfun into feature-fourtech
Removing obsolete 'technology' pref field.
Merge branch 'development' into feature-fourtech
Allowing chebfun to make fourtechs. Still restricted to [-pi,pi].
Adding display data.
Making chebfun/plot() work for chebfun objects with fourtechs.
Fixed simplify to use the right tolerances.
Renamed file coefplot to coeffplot and fixed code to plot properly on a loglog scale.
Added a simplify after multiplication is done.
Merge branch 'feature-fourtech' of https://github.com/chebfun/chebfun into feature-fourtech
adf
Redoing fourtech so that it lives on [-1,1].  This makes bndfun work.

	modified:   @fourtech/diff.m