Fixed version of the CSP algorithm.

Hello, I used the BioSig library for my Master Thesis project and fixed a problem with the CSP algorithm (it didn't work at all for me), and added one missing path to the install.m script.

An example code showing the error with the previous version of the CSP algorithm is presented below:

```
x=rand(10,2);
y=rand(10,2);
r=csp(x,y);
```

Running these 3 lines gives the following error:
```
error: csp_bad: A(I,J,...) = X: dimensions mismatch
error: called from:
error:   /home/kret/programs/biosig-svn/biosig/t300_FeatureExtraction/csp_bad.m at line 60, column 30
```