Expose info fields

[angelcervera]

For my original use case, I did not need information fields like changeset, user id, etc.. But it is true that other people with different use cases would need It. Also, It is not a huge effort to add it.

/* Optional metadata that may be included into each primitive. */
message Info {
   optional int32 version = 1 [default = -1];
   optional int64 timestamp = 2;
   optional int64 changeset = 3;
   optional int32 uid = 4;
   optional uint32 user_sid = 5; // String IDs

   // The visible flag is used to store history information. It indicates that
   // the current object version has been created by a delete operation on the
   // OSM API.
   // When a writer sets this flag, it MUST add a required_features tag with
   // value "HistoricalInformation" to the HeaderBlock.
   // If this flag is not available for some object it MUST be assumed to be
   // true if the file has the required_features tag "HistoricalInformation"
   // set.
   optional bool visible = 6;
}

/** Optional metadata that may be included into each primitive. Special dense format used in DenseNodes. */
message DenseInfo {
   repeated int32 version = 1 [packed = true]; 
   repeated sint64 timestamp = 2 [packed = true]; // DELTA coded
   repeated sint64 changeset = 3 [packed = true]; // DELTA coded
   repeated sint32 uid = 4 [packed = true]; // DELTA coded
   repeated sint32 user_sid = 5 [packed = true]; // String IDs for usernames. DELTA coded

   // The visible flag is used to store history information. It indicates that
   // the current object version has been created by a delete operation on the
   // OSM API.
   // When a writer sets this flag, it MUST add a required_features tag with
   // value "HistoricalInformation" to the HeaderBlock.
   // If this flag is not available for some object it MUST be assumed to be
   // true if the file has the required_features tag "HistoricalInformation"
   // set.
   repeated bool visible = 6 [packed = true];
}

Subtasks:

• DenseInfo in DenseNodes
• Info in Nodes
• Info in Ways
• Info in Relations
• visible field special case.
  • In DenseInfo
  • Not in DenseInfo
• Update documentation