Added a new 'memwithbuffersperc' variable

[mfluhr]

Description

Added a new 'memwithbuffersperc' variable to get the percentage of memory in use, including memory used by system buffers and caches.

As an Android OS developer, I am rebuilding the AOSP daily, and the build process is heavily multi-threaded, consuming almost all my RAM. Since I want to avoid the oomd killer kicking in, I am closely monitoring RAM usage, not only using mem and memperc, but also memwithbuffers.

Since there is no memwithbuffersperc variable available, I tought this might be a great addition both for completeness and statistics purposes.

The code should not affect existing conky configurations, since it is a new variable addition.
It has been tested locally using the following configuration

[...]
${font DejaVu Sans:bold:size=14}MEMORY ${hr 2}${font}${voffset 8}
${font DejaVu Sans:bold:size=10}RAM${font}${alignc}$mem / $memmax${alignr}${font DejaVu Sans:bold:size=10}$memperc%${font}${voffset 2}
${membar 16}${voffset 4}
${font DejaVu Sans:bold:size=10}BUFFERED${font}${alignc}$memwithbuffers / $memmax${alignr}${font DejaVu Sans:bold:size=10}$memwithbuffersperc%${font}${voffset 2}
${memwithbuffersbar 16}${voffset 4}
${font DejaVu Sans:bold:size=10}SWAP${font}${alignc}${swap} / ${swapmax}${alignr}${font DejaVu Sans:bold:size=10}${swapperc}%${font}${voffset 2}
${swapbar 16}
[...]

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[Caellian]

I think it would be better if this was an optional argument for mem and memperc instead of a new variable. You only need to check "-b" in args, so it should be straightforward, and there are plenty of examples ranging from simple to advanced.