Compiler messages Warnings and Hints upcon compiling

[S.Langhammer]

Imaging Version: 0.77.1
Compiler: Delphi XE3
Operating System: Windows 10

Upon compiling a project I got the attached compiler messages.

They roughly translate to:
[dcc32 Warning] imjerror.pas(387): W1057 Implicit string conversion from 'AnsiString' to 'string'
[dcc32 Warning] imjerror.pas(404): W1057 Implicit string conversion from 'AnsiString' to 'string'
[dcc32 Warning] imjerror.pas(404): W1058 Implicit string conversion with potential data loss from 'string' to 'AnsiString'
[dcc32 Warning] imjdmaker.pas(1622): W1024 Combination of signed and unsigned types - expanding both operands
[dcc32 Warning] imjdmaker.pas(1926): W1024 Combination of signed and unsigned types - expanding both operands
[dcc23 Hint] imjcapimin.pas(165): H2077  A value assigned to 'client_data' is never used
[dcc23 Hint] imjcapimin.pas(683): H2077  A value assigned to 'scanptr' is never used
[dcc23 Hint] imjcapimin.pas(696): H2077  A value assigned to 'scanptr' is never used
[dcc32 Warning] ImagingCanvas.pas(1991): W1024 Combination of signed and unsigned types - expanding both operands