Improve makefile

[brauliohms]

Follows improve Makefile for better compatibility with other systems. Patch according to Debian packaging, because I am the maintainer of the package in Debian.

[Euro20179]

The install rule should not also run the doc and addons rules, they should remain separate.
Some people may not want documentation, and the addons are meant to be addons, not something that comes with the program unless explicitly opted into.

Also the all rule does nothing.

[brauliohms]

The current makefile not containing the 'ALL' will have a problem when doing the make command, because make is equal to the make all command and the fact of not having the all: blank, will perform the installation of the first target that is the doc: then the recommended would be to put the all: without dependencies and commands for the make command not to install the doc target.

[Euro20179]

If doing just make runs the first target, then I think I can just move install to the top.
When I add the all: target, and run make it says Nothing to be done for 'all' even though ytfzf is not installed.

[brauliohms]

If you put just the all: it is enough for the make command to do nothing in the case of YTFZF, because the make command is for building and in the case of ytfzf we don't need to build, we just need to install. So a good suggestion to improve the Makefile, would be to add the blank all:.

[Euro20179]

would it be a bad idea to do all: install instead of having a blank all:?

[brauliohms]

if you put all: install the make command will run the 'install target', and this is not correct, because the all: is used to build a program (if it was in C it would be time to use GCC to build the binary) but in the case of YTFZF the binary is a script and does not need to be built, just installed, so you need to leave a blank build instruction with all: for nothing to be built. When you need to install the binary (ytfzf script) the correct is to use make install or make install docs addons (according to your need).

[Euro20179]

Ok, cool, I'll reopen this pull request, but can you get rid of the install: doc addons part?

[brauliohms]

Ok, I understood that the user has the freedom of what to install, I will remove this part of the patch.