Small fixes to 9.1 and 9.2.
Fixed: Some files were in the wrong folders.
Added 10.3 (Spanish translation to 9.3) and did a little correction to 9.3.
Added answers to practice exercises 10.1, 10.2 and 10.4.
Added answer to exercise 8.4 (En).
Added answer to exercise 8.4 (En).
Added answer to exercise 10.1 (En).
Added answers to exercises 10.2 and 10.3 (En).
Added Spanish version of the program 8.1 as 9.1.
Added the Spanish version of the program 8.2 as 9.2.
Added Spanish version of the program 8.3 as 9.3.
Added Spanish version of the program 8.4 as 9.4.
Small fixes to code in 8.2 (En) and 9.2 (Es).
Added Spanish versions of the chater 10 programs as 11.01 to .03.
Small fixes to Es 9.4 and Es 10.2.
Small fix to markdown in README.