Enhance the way signalhunter add path

[vhosouza]

Signal Hunter add the current folder to the MATLAB path, so if user run signalhunter command from any path it will add every time it runs to the matlab path. If user has many folders in the current folder it can mess a lot the PATH of matlab.

[vhosouza]

Functions to work with directory and file paths without knowing the OS:

filesep: returns the file sepparator character for the running OS
fileparts: returns the parts of a path, e.g. filename, path and file extension
fullfile: the best one, you give the parts of the path and it build the full path regardless the OS

Some examples:

My1stDir = 'Year2012';
My2ndDir = 'Feb';
My3rdDir = 'Day03';

MyDir = [ 'mydata', filesep, My1stDir, filesep, My2ndDir, filesep, My3rdDir ];

f = fullfile('myfolder','mysubfolder','myfile.m')

f =

myfolder\mysubfolder\myfile.m