readme.md: Fix typos and add info on make clean and build dependencies

README.md

@@ -130,7 +130,7 @@ If you want to give a try to the parallelized versions of some mex files (`A_tim
 ```
 If the configuration goes well, the script will tell you which components are correctly configured and will be built.
 
-### Bulding
+### Building
 
 Binaries and Info documentation are built with:
 ```
@@ -162,7 +162,7 @@ make check-matlab
 ```
 or only with Octave:
 ```
-make check-matlab
+make check-octave
 ```
 A summary of the results is available in `tests/run_test_matlab_output.txt` or `tests/run_test_octave_output.txt`. Often, it does not make sense
 to run the complete testsuite. For instance, if you modify codes only related to the perfect foresight model solver, you can decide to run only a
@@ -178,7 +178,7 @@ or with Octave:
 ```
 make o/deterministic_simulations
 ```
-Finally if you want to run a single integration test with Matlab:
+Finally if you want to run a single integration test, e.g. `deterministic_simulations/lbj/rbc.mod` with Matlab:
 ```
 make deterministic_simulations/lbj/rbc.m.trs
 ```
@@ -194,12 +194,18 @@ or
 ```
 make deterministic_simulations/lbj/rbc.o.drs
 ```
+Note that only tests will be executed where the `m.trs/o.trs` does not yet exist. You can run
+```
+make clean
+```
+in the `tests` folder to delete files that were created by the run of the testsuite. You can also manually delete the desired `m.trs/o.trs` file(s).
 
 ## Debian or Ubuntu
 
 All the prerequisites are packaged.
 
-The easiest way to install the pre-requisites in Debian is to use Debian's dynare package and do:
+The easiest way to install the pre-requisites in Debian is to use Debian's dynare package and do 
+(requires that you have added the `deb-src` repositories to your `sources.list`):
 ```
 apt-get build-dep dynare
 ```