[Rpm-maint] [rpm-software-management/rpm] More work on the Reference Manual (#1691)

[Panu Matilainen]

@pmatilai commented on this pull request.



> +There are four unsigned integer types for RPM tags:
+
+* `int8`
+* `int16`
+* `int32`
+* `int64`
+
+`int8` and `int16` are rarely used. Most integer tags are `int32` with a few `int64` replacements where 32 bits were just not enough. These being unsigned limits time stamps to 1970-01-01 and later.
+
+Additionally there is a `char` datatype that is also only used once.
+
+There is a `bin` datatype for arbitrary data that is basically an `char` array.
+
+There are two string types: Plain `string` with is zero terminated and of arbitary length (within the header size restriction).
+
+`i18nstring`s are translated to the requested local when queried.

There are actually three different string types: string, which is always a single string, string array (which can obviously be of size 1 still) and i18nstring.

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